ST ST25RU3993, User Manual

Page: 44 / 68

Reader Settings UM2268
44/68 UM2268 Rev 6
4.1.7 Gen2 settings panel
Figure 42. Gen2 link setting
Where:
• Link frequency : Changes the backscatter link frequency to:
– 40 kHz
– 160 kHz
– 213 kHz
– 256 kHz
– 320 kHz
– 640 kHz
•
Coding : Changes the coding to:
– FM0
– Miller 2
– Miller 4
– Miller 8
• Target : Tags whose inventory flag match this parameter participate in the inventory
round. The target value can be fixed to either A or B or alternating starting with A or
with B:
–
A
– B
•
Session : Defines the session parameter of the query command and hence changes
the persistence time of the inventoried flags of tags:
–
Repeated Search (S0): The inventoried flag state is maintained if the tag remains
powered. If the tag loses power the inventoried flag state is reset to A. Once
inventoried, tags respond again if the target is switched or when the RF power is
cycled.
– Multiple Search (S1): The inventoried flag state is kept for at least 500 ms and 5
seconds at most, regardless of the tag being powered or not. Tags participate less
frequently in inventory rounds unless the target is switched.
– Single Search (S2, S3): The inventoried flag state is maintained if the tag remains
powered or for at least 2 seconds after losing power. As there is no maximum time
defined, tags may keep the inventoried flag state for an extended period. Once